Grinding-machine.



J. O. SPENOB.

GRINDING MACHINE.

APPLICATION FILED JULY 11, 1913.

1,121,773. Patented Dec. 22, 1914.7

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GRINDING MACHINE.

APPLICATION FILED JULY 11,1913.

1,121,773, Patented Dec. 22, 1914.

2 SHEETS-SHEET Z.

10 x/ wzf WZW UNITED STATES PATENT oFFIoE.

JOHN'C. SPENCE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T0 NORTON GRINDING COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

GRINDING-MACHIN E.

To all whom it may concern Be it known that 1, Joan C. SrnNon, a citizen of the United States, residing at WVorcester, in the county of Worcester and State of Massachusetts,-have invented a new and useful Grinding-Machine, of which the following is a specification.

This invention relates to grinding machines of the class in which provision is made for feeding the grinding wheel transversely relatively to the work.

The invention is designed primarily as an improvement upon grinding machines of the type disclosed in the patent to Norton, No. 762,838, issued January 14, 190-1, and has to do with an improved automatic crossfeed for such a machine. The machine shown in the Norton patent is provided with an automatic cross feed which is connected to a reversing lever operated by adjustable dogs upon the longitudinally movable work carriage. As the carriage approaches the end of its travel in either direction, the lever is reversed by one of the dogs and each movement of the lever in either direction operates the cross feed to move the grinding wheel toward the work. Upon certain classes of work, however, it is found desirable to feed the wheel directly forward into the work while the latter is held in fixed longitudinal position relative to the wheel. Under these conditions the dogs are inoperative and it is necessary to depend entirely upon manual actuation of the cross feed. This necessitates the constant attendance of an operator for each machine and materially increases the cost of operation.

The object of my invention is to provide a grinder in which the cross feed may be automatically operated independently of the longitudinal travel of the work carriage.

My invention further consists of certain devices, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to one skilled in the art.

A preferred form of my invention is shown in the drawings in whiche- Figure 1 is a front elevation of a grinding machine having my improvements at- Application filed luly 11, 1913. Serial No. 778,448.

Patented Dec. 22, 1914..

tached thereto: Fig. 2 is an enlarged view of the cross feed operating mechanism: Fig. 3 is a sectional detail view on the line 33 of Fig. 2:-and Fig. 4 is a partial sectional view showing the connections to the grinding wheel carriage.

Referring to Fig. 1, my invention is shown in connection with a machine in which the work carriage 10 is longitudinally movable and has mounted thereon adjustable dogs 11 and 12. These dogs as they approach the end of their travel contact with areversing lever 13 mounted to turn about a pivot 14; The reversinglever 13 has rigidly secured thereto a curved arm 15 (see Fig. 2) to which is adjustably secured a sleeve 16. Pivotally connected to an extension on the sleeve 16 is a rack 17 meshing with a pinion 18. The pinion 18 is sepin 20 to the disk 19 and is moved thereby to feed the pick wheel 24 which is connected through suitable gearing with the feed screw 25 which turns in a threaded nut 26 mounted below the grinding wheel carriage 27.

The parts thus far described form no part of my invention, and a more complete disclosure thereof may be found in the patent to Norton, No. 762,838.

Referring to Fig. 2, the curved arm 15 on the reversing lever 13 is provided with a downward extension 28 bearing a stud 29. Det achably connected with the stud 29 is a link 30 provided at one end with an openended slot, the other end of said link being secured to the vertical arm 31 of a bell crank mounted on the stud 32. The horizontal arm 33 of the bell crank is connected to a coil spring 34 which yieldingly forces the across feedfcflthe grinding wheel, manual dinally thereby bringing the dogs 11 and 12 alternately into contact with the reversing lever 13 and moving the rack 17 alternately' in op osite directions. Each movement thereo actuates the feed pawl 21 to move the grinding wheel carriage toward the work. l

It is evident, of course, that when the longitudinal travel of the work carriage is discontinued the mechanism just described will m longero crate. Under these conditions the detachable link 30 may be connected with the stud 29 and the constantlyrotating cam 36 will then operate through the bd crank Bland the link 80 to oscillate the reversing leverand' to thus automatically operate the cross feedindependently of the longitudinal travel of the work carriage.

A bracket 38 (see Fig. 2) is provided in which'the link 30 may rest when disconnectedfrom the stud 29. A handle 39 (see Fig. 4) 'is also provided by which the cross teed-may be manually operated.

I--am aware that many modifications of my device may be made by those skilled in the art without departing from the spirit and scope of my invention and I- do not wish to be limited to the details disclosed herein, but r e What I. do claim is:'-' 1 '1. In a grinding machine, in combination across feed for the grinding wheel, auto; maticallynaetuated drivin 1 means for said cross feedand-auxilia said cross feed automatically actuated independently oft-the first mentioned driving means. i I

2. In a grinding machine, in combination means-fcfactuatingsaid cross feed, auto- -m8.tl6- means'dependent on the-work feed for actuating said cross feed, and auxiliary automatic means-independent of the. work '7'. ,feed for actuating saidcrosafeed. 3. In a grindin machine, in combination a. grinding whee 2a.- cross feed. for said grindin wheel,ia'utomatic means controlled by-.the='- fi ngitudinal travel of the work cara e-for driving said cross feed: and'a-sec:

n on automatic means operating independ- =ently of the travel of the carriage for drivingsaidcrossfeed. v

.4 In a .machine, in combination a cross feed for .the grinding wheel,- automatic meansior-actuating said cross feed, auxiliary *means for. actuating said. cross feed, and detachable connections between said auxiliary matic meansJ'. a a

5. In a grinding-machine, in combination a cross feed-for the grinding wheel, auto- .matic means for actuatin said cross-feed andauxiliary mechanism For actuating said cross feed, said auxiliary mechanism being riving means for ,mechanism and said automovable work carriage, means on said carriage to oscillate said lever and auxiliary means operating independently of the carriage for oscillating said lever.

7; In a grinding machine, in combination 7 a cross feed for the grinding wheel,- an oscillating reversing lever, .adwstableconnections from said lever to said cross feed, a

rotary shaft having a cam thereon, a cam follower yieldingly engaging said cam, and

connections between said cam follower and said lever whereby the rotating cam. may actuate the cross feed.

8. In a grinding machine, in combination .a cross feed for the grinding wheel, operating mcchanism'therefor, including an oscillating lever having a downward extension bearing a rojecting stud, a cam-operated arm, and a 'nk pivoted to said arm and hav-- ing at its other extremity an open-ended slot for detachably engaging said stud.

9. In a grinding mac .tion' with the bed or support, a grinding wheel or disk movable laterally' -on said support towardand from the work, a work tablei iaving a reciprocating motion at right angles'to said grinding wheel, driving gear for operatin 4 said work table, and mecha-- msm for ad usting said grindin wheel in ine, the combinarelation to the work, operable.v elther from I 5 the reciprocating Work table or from the dllVlIIg gear independently of the work. ta-

.ble, substantially as described.

Y. 10. In combination on a grinding machine, a work table having reciprocating movement, a grinding wheel, driving. means .for the work. table, means for adjusting the grinding .wheel 1n a direction transversely of the work table and an operatingconnection for said-adjusting means operable 4 eithenfrom the reciprocating carnage or the drivinggear,substantially as described. llplmcombination in. a -grinding machine, driving means, a Work holdingtable,

means.for .reciprocatingsame, a grinding .wheel, a rack bearing arm, mechanism operated thereby to adjust said grinding wheel in relat1on to the work, means foroperating said rack by the reciprocating of the .work

table, and means for operating. the rack fronr irthe driving means of the machine independently of the said work table or slide, substantiallyas described... v

12. In combination in a grinding mach1ne,.dr1ving means .for same, a reciprocating work holding table, a grinding wheel,

a rack bearing arm or member, means opmy hand, in the presence of two subscribing eratetll thereby tg adjusll; said grinding wheel w 1tnesses. in re ation to t e wor sai rack bearin 1- arm being oyerable either from the war? 'JOHh SPENCE" 5 table or by sald driving means, substantially Witnesses:

as described. S. H. ARMDEN, In testimony whereof I have hereunto set W. A. PEIRGE.

copies at this patent may be obtained for five cents each, by addressing the Commissioner of Tatentl- Washington, D. G. 

